Learning Fritzing, beginning difficulties

The problem isn't you the Fritzing parts database is somewhat incomplete. In this case it doesn't contain a bridge rectifier. So your next choice is google and/or the parts submit forum in here (both in this case as google sent me back here although I remembered seeing this earlier antway). If that doesn't work you need to create your own part (and hopefully submit it for others as this person has). While parts creation isn't easy there are helpful people in here that will give you a hand so that we all benefit